Tom Warkentin

Tom Warkentin
University of Saskatchewan | U of S · Department of Plant Sciences

40.64
 · 
PhD
About
260
Research items
27,455
Reads
3,480
Citations
Research Experience
Jul 1999 - Mar 2016
University of Saskatchewan
Position
  • Professor
Jul 1999 - Dec 2015
University of Saskatchewan
Position
  • Professor
Sep 1992 - Jun 1999
Education
Jan 1988 - Feb 1992
University of Saskatchewan
Field of study
  • Crop Science
May 1984 - Apr 1986
University of Manitoba
Field of study
  • Plant Science
Sep 1979 - Apr 1983
University of Manitoba
Field of study
  • Agriculture
Network
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Following
Projects
Projects (6)
Archived project
The goal of this research was to evaluate the effects of heat stress on pollen development and seed set in pea cultivars and germplasm. The effect of heat stress on pollen development and seed set were evaluated from floral biology, crop physiology, and plant breeding perspectives.
Research
Research items (260)
Article
Field pea (Pisum sativum), a major grain legume crop, is autogamous and adapted to temperate climates. The objectives of this study were to investigate effects of high temperature stress on stamen chemical composition, anther dehiscence, pollen viability, pollen interactions with pistil and ovules, and ovule growth and viability. Two cultivars (‘CD...
Conference Paper
Full-text available
The inclusion of forage pea (Pisum sativum L.) in mixtures with forage barley (Hordeum vulgare L.) or oat (Avena sativa L.) for greenfeed or silage production is gaining interest in western Canada. A twelve-different combination of monocultures and mixtures were evaluated for forage dry matter (DM) yield and forage quality in three soil zones of Sa...
Article
Full-text available
Background: The objective of this research was to map quantitative trait loci (QTLs) of multiple traits of breeding importance in pea (Pisum sativum L.). Three recombinant inbred line (RIL) populations, PR-02 (Orb x CDC Striker), PR-07 (Carerra x CDC Striker) and PR-15 (1-2347-144 x CDC Meadow) were phenotyped for agronomic and seed quality traits...
Article
Full-text available
Main conclusion ATR-FTIR spectroscopy in combination with uni- and multivariate analysis was used to quantify the spectral–chemical composition of the leaf cuticle of pea, investigating the effects of variety and heat stress. Field pea (Pisum sativum L.) is sensitive to heat stress and our goal was to improve canopy cooling and flower retention by...
Article
Folates are essential co-factors for one-carbon metabolism and are needed in human diets. Pulses, such as common bean, lentil and chickpea contain significant amounts of folates. Ultra-performance liquid chromatography coupled with selective reaction monitoring mass spectrometry was used to study the stability of twelve folate monoglutamates at thr...
Article
Prevailing global warming has challenged agricultural production such that it is paramount to evaluate crop cultivars that tolerate increasing temperatures. Heat tolerance in many crops has been screened by examining in vitro pollen germination. The objectives of this study were to determine the effects of high temperature on in vitro pollen germin...
Article
CDC Inca, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2015 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Inca has good lodging resistance, medium-sized round seeds, and good yielding ability...
Article
CDC Spectrum, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2016 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Spectrum has good lodging resistance, medium-sized round seeds, and good yielding...
Article
CDC Spruce, a green cotyledon field pea (Pisum sativum L.) cultivar, was released in 2016 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Spruce has good lodging resistance, medium-sized round seeds, and good yielding abil...
Article
CDC Canary, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2017 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Canary has good lodging resistance, medium-sized round seeds, early maturity, and g...
Article
CDC Athabasca, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2016 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Athabasca has good lodging resistance, large-sized round seeds, and good yieldin...
Article
CDC Forest, a green cotyledon field pea (Pisum sativum L.) cultivar, was released in 2017 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Forest has good lodging resistance, medium-sized round seeds, and good yielding abil...
Article
Biological nitrogen fixation (BNF) can be improved by optimizing the interaction between the rhizobial inoculant and pea (Pisum sativum L.), leading to increased productivity and reduced nitrogen (N) fertilizer use. Eight Rhizobium leguminosarum bv. viciae strains were used to inoculate super-nodulating pea mutant Rondo-nod3(fix+), hyper-nodulating...
Article
Field pea (Pisum sativum) is an important pulse crop globally for human consumption and livestock feed. A panel of 92 diverse pea cultivars was evaluated across nine environments and genotyped using 1536 single nucleotide polymorphisms (SNPs) arranged in a GoldenGate array. Population structure analysis revealed three subpopulations roughly consist...
Article
Full-text available
Synchrotron techniques are powerful tools in material and environmental sciences. However, they are currently underutilized in plant research. The Canadian Light Source synchrotron on the University of Saskatchewan campus is the only such facility in Canada, open to academic, government, and industrial clients. This review introduces the potential...
Article
There is little information on soybean [Glycine max (L.) Merr.] grown in western Canada despite its expanding acreage in this region. This study quantified the yield and uptake of nitrogen (N) and phosphorus (P) in three short-season soybean varieties (in 2014) and their impact on following wheat and canola crops, as well as soil nutrient supplies...
Article
Full-text available
Optimized biological nitrogen fixation (BNF) in pea (Pisum sativum L.) could increase crop productivity and reduce nitrogen fertilizer use in Western Canada. We tested the BNF capabilities and growth of three pea nodulation mutants (Frisson P64 Sym29, Frisson P88 Sym28 and Rondo-nod3 (fix+)) compared to check cultivars (CDC Dakota, CDC Meadow, Fris...
Article
Full-text available
Ascochyta blight (AB) is an important disease of pea which can cause severe grain yield loss under wet conditions. In our previous study, we identified two quantitative trait loci (QTLs) abIII-1 and abI-IV-2 for AB resistance and these QTLs were consistent across locations and/or years in an inter-specific pea population (PR-19) developed from a cr...
Article
Full-text available
High-throughput/low-cost/low-tech methods for phytic acid determination that are sufficiently accurate and reproducible would be of value in plant genetics, crop breeding and in the food and feed industries. Variants of two candidate methods, those described by Vaintraub and Lapteva (Anal Biochem 175:227–24, 1988; “VL” methods) and Huang and Lantzs...
Article
Field pea (Pisum sativum L.) is a nutritious pulse crop consumed as food and animal feed in many countries. The present study was performed to determine the potential effects of Fe, phytate, and carotenoid concentrations on Fe bioavailability (FeBIO) of field pea seeds. Selected PR-07 (recombinant inbred line [RIL] population derived from the cross...
Article
Full-text available
One hundred and seven recombinant inbred lines (RILs) were developed from the cross of field pea (Pisum sativum L.) cultivars CDC Centennial × CDC Sage with the objectives of evaluating phenology and yield components, and to map the quantitative trait loci (QTLs) responsible for these traits. Experiments were conducted in 2013 using normal seeding...
Article
The goal of this research was to investigate the physicochemical and functional properties of protein isolates obtained from several pea cultivars grown at two locations in Canada. The functionalities of the pea protein isolates (PPIs) were then compared with those of commercial food protein ingredients derived from milk, egg, pea, soy, and wheat....
Poster
Full-text available
Western Canada produces field pea (Pisum sativum L.) as a dryland crop, where it is exposed to heat stress when temperatures exceed 28°C. Several days of heat cause flower and pod abortion and most cultivars are heat sensitive. To seek traits for improved heat resistance we measured a 94 member pea collection. Pea cultivars originated from north Am...
Presentation
Full-text available
Elevated temperatures pose a threat to global crop production with current climate change. A better understanding of how heat stress impacts seed development will enable successful screening for heat-resistant cultivars to maintain agricultural food production. The objectives of this study were to screen for heat-resistant field pea (Pisum sativum)...
Article
The objective of this study was to determine the molecular structure and properties of recently released cultivars of field peas [CDC Golden (CDCG), Abarth (ABAR), CDC Patrick (CDCP) and CDC Amarillo (CDCA)] grown at different locations in Saskatchewan, Canada. Starch yield (on whole seed basis), apparent amylose, total lipid and specific surface a...
Article
Full-text available
Key message: This work discusses several selected topics of plant genetics and breeding in relation to the 150th anniversary of the seminal work of Gregor Johann Mendel. In 2015, we celebrated the 150th anniversary of the presentation of the seminal work of Gregor Johann Mendel. While Darwin's theory of evolution was based on differential survival...
Article
The objective of this study was to produce a pea flour ingredient with higher slowly digestible (SDS) and resistant (RS) starch fractions for functional food applications. Heat-moisture treated flour (HMTF) in the presence of citric, gallic, or vanillic acids and esterified flour (EF) with citric acid were prepared and analyzed for structure and fu...
Conference Paper
While synchrotron techniques are powerful tools in material and environmental sciences, it is still underutilized in plant research. The Canadian Light Source synchrotron located on the campus of the University of Saskatchewan is the only such facility in Canada and is open to academic and government researchers, and industrial clients. This talk i...
Article
Full-text available
In the plant breeding cycle, the length of time from seed to seed is often a limiting factor in producing pure lines or recombinant inbred lines (RILs). The objective of this research was to accelerate the production of field pea RILs while maintaining the population size, through application of a technique referred to as ‘rapid generation technolo...
Article
Full-text available
In western Canada, chickpea (Cicer arietinum L.) production is challenged by short growing seasons and infestations with ascochyta blight. Research was conducted to determine the genetic basis of the association between flowering time and reaction to ascochyta blight in chickpea. Ninety-two chickpea recombinant inbred lines (RILs) developed from a...
Article
Artificial light in growth chambers typically has a higher red to far-red (R:FR) ratio compared with natural light. This higher ratio may delay flowering and reduce plant height in some long-day plants. Modification of light spectral quality to lower than the critical threshold of R:FR for a given plant species can have important implications with...
Article
Full-text available
Photoperiod is one of the major environmental factors determining time to flower initiation and first flower appearance in plants. In chickpea, photoperiod sensitivity, expressed as delayed to flower under short days as compared to long days, may change with the growth stage of the crop. Photoperiod sensitive and insensitive phases were identified...
Article
Ascochyta blight of pea (Pisum sp.), caused by Peyronellaea pinodes, often results in serious yield losses. Some accessions of Pisum fulvum Sibth. & Sm. previously showed high levels of resistance and could be used as sources of new resistance genes. The objectives of this study were to develop a single nucleotide polymorphism (SNP)-based linkage m...
Article
SNP arrays represent important genotyping tools for innovative strategies in both basic research and applied breeding. Pea is an important food, feed, and sustainable crop with a large (ca. 4.45 Gb) and not yet available genome sequence. In the present study, 12 pea recombinant inbred line populations were genotyped using the newly-developed GenoPe...
Article
Full-text available
Pea (Pisum sativum L.) is an annual cool-season legume and one of the oldest domesticated crops. Dry pea seeds contain 22-25% protein, complex starch and fiber constituents, and a rich array of vitamins, minerals, and phytochemicals which make them a valuable source for human consumption and livestock feed. Dry pea ranks third to common bean and ch...
Article
Full-text available
Knowledge of the time required for the initiation of flowering is important for chickpea adaptation in environments like western Canada, not only because flowering is a vulnerable stage of development but also it is a major factor affecting variation in crop duration. Temperature and photoperiod are the major environmental factors that determine ti...
Article
To accelerate development of pea cultivars with improved nutritional profiles, information about allelic variations within genes for major seed composition in diverse pea accessions is required. The objective of this study was to identify single nucleotide polymorphisms (SNPs) within genes associated with amylose, total starch and crude protein con...
Article
The objectives of this study were (1) to quantify the protein inherent molecular structural features of green cotyledon (CDC Striker) and yellow cotyledon (CDC Meadow) pea (Pisum sativum L.) seeds using molecular spectroscopic technique (FT/IR-ATR); (2) measure the denaturation of protein molecular makeup in the two types of pea during dry roasting...
Article
Full-text available
Although yield and total biomass produced by annual legumes remain major objectives for breeders, other issues such as environment-friendly, resource use efficiency including symbiotic performance, resilient production in the context of climate change, adaptation to sustainable cropping systems (reducing leaching, greenhouse gas emissions and pesti...
Article
Surface characteristics and functional attributes of protein isolates prepared from different pea cultivars using isoelectric precipitation were investigated. Protein levels of isolates ranged from 81–89% with isoelectric points occurring between pH 4.7–4.9. Surface hydrophobicity values differed among cultivars with CDC Dundurn and CDC Striker iso...
Article
Pea (Pisum sativum L.) is important globally as a cool season crop. Pea cultivars are heat-sensitive so our goal was to investigate how weather impacted growth and yield in recent cultivars in the Co-operative pea yield trials (2000 to 2009) for a dryland (Saskatoon) and an irrigated (Outlook) location. We explored relationships between days to mat...
Poster
Full-text available
Mid-Infrared and high energy X-ay spectroscopy were used to analyze the organic and mineral composition of pea seeds from two genotypes of peas that differ in phytic acid content. Mid-IR absorption spectra of bulk pea seed samples were used to assess the spectral differences between the two pea genotypes and identify the absorption maxima of spectr...
Article
Full-text available
Phytate, the storage form of P in seeds, is not well digested by monogastrics, thereby contributing to micronutrient deficiency, decreased feed efficiency, and environmental pollution. This research was aimed at developing a single nucleotide polymorphism (SNP) based genetic linkage map and mapping genomic regions associated with phytic acid-phosph...
Article
Full-text available
Association analyses of iron (Fe), zinc (Zn) and selenium (Se) concentrations in seeds of field pea (Pisum sativum L.) were done using a panel of 94 diverse accessions. The panel genotypes were grown at two locations in the province of Saskatchewan, Canada, in 2011 and 2012 growing seasons. A total of 1,233 EST-based single-nucleotide polymorphism...
Article
Full-text available
Field pea (Pisum sativum L.) seeds have high nutritional value but also contain potential antinutritional factors, such as phytate and polyphenols. Phytate can store up to 80% of the phosphorus in seeds. In the seed and during digestion it can complex minerals such as iron and zinc and make them unavailable for absorption. Also, it is not well dige...
Article
Full-text available
Flowering time is a key factor in determining the adaptation of crops to diverse environments. Temperature and photoperiod are the two major environmental variables that affect the length of the period between sowing and flowering and the rate of plant development. The objectives of this research were to examine the days to flowering of selected ch...
Article
Full-text available
Low phytic acid (lpa) crops are low in phytic acid and high in inorganic phosphorus (Pi). In this study, two lpa pea genotypes, 1-150-81, 1-2347-144, and their progenitor CDC Bronco were grown in field trials for two years. The lpa genotypes were lower in IP6 and higher in Pi when compared to CDC Bronco. The total P concentration was similar in lpa...
Article
Protein isolates prepared from three pea cultivars by alkali extraction/isoelectric precipitation (AE-IP), salt extraction-dialysis (SE) and micellar precipitation (MP) were assessed for their surface (charge, hydrophobicity) and functional (water/oil holding capacity, solubility, foaming and emulsion capacities/stabilities) properties. Isolate yie...
Article
Full-text available
CDC Greenwater, a green cotyledon field pea (Pisum sativum L.) cultivar, was released in 2014 by the Crop Development Centre, University of Saskatchewan, for distribution to Select seed growers in Saskatchewan and Alberta through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Greenwater has good lodging resistance, powdery mil...
Article
Full-text available
CDC Raezer, a green cotyledon field pea (Pisum sativum L.) cultivar, was released in 2011 by the Crop Development Centre, University of Saskatchewan, for distribution to Select seed growers in Saskatchewan and Alberta through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Raezer has good lodging resistance, powdery mildew resi...
Article
Full-text available
Chickpea (Cicer arietinum L.) is the world's second most important pulse crop after common bean. Chickpea has historically been an important daily staple in the diet of millions of people, especially in the developing countries. Current chickpea breeding programs have mainly been directed toward high yield, biotic and abiotic stress resilience that...
Article
Full-text available
Development of pea cultivars with improved resistance to ascochyta blight disease has been hindered due to lack of strong resistance. The objective of this study was to identify single nucleotide polymorphisms (SNPs) within the candidate genes associated with ascochyta blight resistance that can be used to aid selection. A total of 54 diverse Pisum...